Distributed Signcryption from Pairings

摘要

The distributed signcryption scheme was proposed by Mu and Varadharajan in their paper presented at INDOCRYPT 2000. Since then some more schemes have been proposed for distributed signcryption and extended for group signcryption. In 2007, Li et al [15] proposed signcryption scheme with key privacy. In this paper, we extend this scheme and propose a scheme for distributed signcryption based on pairings. Further, we extend distributed signcryp tion protocol to group signcryption. Finally, the security analysis of the protocols has been carried out based on difficulty of Diffie-Hellman prob lem in Gap Diffie-Hellman groups.